System Time

A user-defined time can be setup for e.g., for simulation purposes, or if no external reference is available.

The battery-backed RTC time can be used as System Time, until an external reference become available.

Configuring the System Time

To configure the System Time:

Navigate to MANAGEMENT > OTHER: Time Management.

In the System Time panel located in the top-left corner of the Time Management screen, click the GEAR icon.

The Edit System Time pop-up window will display.

In the System Timescale field select a timescale from the drop-down list. The options are:

UTC: Coordinated Universal Time (Temps Universel Coordonné); your local time zone determines the difference between UTC and local time.

Note that UTC is not a time zone, but a time standard, i.e. it is not used anywhere in the world as the official local time, whereas GMT (Greenwich Mean Time) is a time zone that is used in several European and African countries as the official local time.

TAI: International Atomic Time (Temps Atomique International)

The TAI time scale is based on the SI second and is not adjusted for leap seconds. As of October 2017, TAI is ahead of UTC by 36 seconds. TAI is always ahead of GPS by 19 seconds.

GPS: The Global Positioning System time is the timescale maintained by the GPS satellites.

Global Positioning System time is the time scale maintained by the GPS satellites. The time signal is provided by atomic clocks in the GPS ground control stations. The UTC–GPS offset as of October 2017 is 17 seconds.